Jim Murren, chairman and CEO of MGM Resorts International, issued the following statement on the mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas:

"Our hearts and prayers go out to the victims of last night's shooting, their families, and those still fighting for their lives. We are working with law enforcement and will continue to do all we can to help all of those involved."

More than 50 people were killed and at least 400 others injured after a gunman, identified as Stephen Paddock, opened fire Sunday night at a country music festival opposite the Mandalay Bay. Paddock, 64, of Mesquite, Nev. was found dead of a self-inflicted gunshot wound after a SWAT team burst into the hotel room from which he was firing at the crowd.

The 43-story Mandalay Bay is owned and operated by MGM Resorts International, owners of the MGM Springfield, which will open in September 2018.

MGM Resorts International purchased the Mandalay Bay in February 2005.